Concise Bible Dictionary:

The name used by the sailors for a tempestuous wind in the Mediterranean, experienced when Paul was being taken to Rome (Acts 27:1414But not long after there arose against it a tempestuous wind, called Euroclydon. (Acts 27:14)). The etymology of the word is not known: some MSS read εὐρακύλων, euraquilo. It may simply imply a furious wind, like a Levanter in modern times, irrespective of the quarter from where it blew.

Jackson’s Dictionary of Scripture Proper Names:

an easterly tempest